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                <h1 id="🍖-SpringBoot-集成-Redis（Lettuce）"><a href="#🍖-SpringBoot-集成-Redis（Lettuce）" class="headerlink" title="🍖 SpringBoot 集成 Redis（Lettuce）"></a>🍖 SpringBoot 集成 Redis（Lettuce）</h1><hr>
<h2 id="1-Jedis-和-Lettuce"><a href="#1-Jedis-和-Lettuce" class="headerlink" title="1. Jedis 和 Lettuce"></a>1. Jedis 和 Lettuce</h2><p><strong>Jedis</strong>  和 <strong>Lettuce</strong> 是 Java 操作 Redis 的客户端。在 Spring Boot 1.x 版本默认使用的是 jedis ，而在 <strong>Spring Boot 2.x 版本默认使用的就是 Lettuce</strong>。关于 Jedis 跟 Lettuce 的区别如下：</p>
<ul>
<li>Jedis在实现上是直接连接的 redis server，如果在多线程环境下是非线程安全的，这个时候只有使用连接池，为每个Jedis实例增加物理连接</li>
<li>Lettuce的连接是基于 Netty 的，连接实例（<code>StatefulRedisConnection</code>）可以在多个线程间并发访问，应为<code>StatefulRedisConnection </code>是线程安全的，所以一个连接实例就可以满足多线程环境下的并发访问，当然这个也是可伸缩的设计，一个连接实例不够的情况也可以按需增加连接实例。</li>
</ul>
<h2 id="2-RedisTemplate-类"><a href="#2-RedisTemplate-类" class="headerlink" title="2. RedisTemplate 类"></a>2. RedisTemplate 类</h2><p>SpringBoot 中用来操作 Redis 的类是 <code>RedisTemplate </code>类：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Bean</span>
<span class="token annotation punctuation">@ConditionalOnMissingBean</span><span class="token punctuation">(</span>name <span class="token operator">=</span> <span class="token punctuation">&#123;</span><span class="token string">"redisTemplate"</span><span class="token punctuation">&#125;</span><span class="token punctuation">)</span> <span class="token comment">// 我们可以自己定义一个 redisTemplate来替换这个默认的</span>
<span class="token keyword">public</span> <span class="token class-name">RedisTemplate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">></span></span> <span class="token function">redisTemplate</span><span class="token punctuation">(</span><span class="token class-name">RedisConnectionFactory</span> redisConnectionFactory<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">UnknownHostException</span> <span class="token punctuation">&#123;</span>
    <span class="token comment">// 默认的 RedisTemplate 没有过多的设置，redis 对象都是需要序列化！</span>
	<span class="token comment">// 两个泛型都是 Object, Object 的类型，我们使用需要强制转换 &lt;String, Object></span>
    <span class="token class-name">RedisTemplate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">></span></span> template <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">RedisTemplate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    template<span class="token punctuation">.</span><span class="token function">setConnectionFactory</span><span class="token punctuation">(</span>redisConnectionFactory<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> template<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>

<span class="token annotation punctuation">@Bean</span>
<span class="token annotation punctuation">@ConditionalOnMissingBean</span> <span class="token comment">// 由于 String 是redis中最常使用的类型，所以单独提出来了一个bean</span>
<span class="token keyword">public</span> <span class="token class-name">StringRedisTemplate</span> <span class="token function">stringRedisTemplate</span><span class="token punctuation">(</span><span class="token class-name">RedisConnectionFactory</span> redisConnectionFactory<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">UnknownHostException</span> <span class="token punctuation">&#123;</span>
    <span class="token class-name">StringRedisTemplate</span> template <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StringRedisTemplate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    template<span class="token punctuation">.</span><span class="token function">setConnectionFactory</span><span class="token punctuation">(</span>redisConnectionFactory<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> template<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><code>RedisTemplate </code>提供了以下方法分别用于对 Redis 的各个数据结构进行操作：</p>
<ul>
<li><code>opsForValue</code>： 对应 String（字符串）</li>
<li><code>opsForZSet</code>： 对应 ZSet（有序集合）</li>
<li><code>opsForHash</code>： 对应 Hash（哈希）</li>
<li><code>opsForList</code>： 对应 List（列表）</li>
<li><code>opsForSet</code>： 对应 Set（集合）</li>
<li><code>opsForGeo</code>： 对应 GEO（地理位置）</li>
</ul>
<h2 id="3-整合测试"><a href="#3-整合测试" class="headerlink" title="3. 整合测试"></a>3. 整合测试</h2><h3 id="①-导入依赖"><a href="#①-导入依赖" class="headerlink" title="① 导入依赖"></a>① 导入依赖</h3><p><img src="https://gitee.com/veal98/images/raw/master/img/20200725102121.png"></p>
<p>或者手动导入依赖：</p>
<pre class="line-numbers language-xml" data-language="xml"><code class="language-xml"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>dependency</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>groupId</span><span class="token punctuation">></span></span>org.springframework.boot<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>groupId</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>artifactId</span><span class="token punctuation">></span></span>spring-boot-starter-data-redis<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>artifactId</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>dependency</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<p>SpringBoot2.x 底层访问默认使用 Lettuce</p>
<h3 id="②-配置文件"><a href="#②-配置文件" class="headerlink" title="② 配置文件"></a>② 配置文件</h3><pre class="line-numbers language-properties" data-language="properties"><code class="language-properties"><span class="token comment"># 配置redis</span>
<span class="token attr-name">spring.redis.host</span><span class="token punctuation">=</span><span class="token attr-value">127.0.0.1</span>
<span class="token attr-name">spring.redis.port</span><span class="token punctuation">=</span><span class="token attr-value">6379</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>

<h3 id="③-测试"><a href="#③-测试" class="headerlink" title="③ 测试"></a>③ 测试</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@SpringBootTest</span>
<span class="token keyword">class</span> <span class="token class-name">RedisDemoApplicationTests</span> <span class="token punctuation">&#123;</span>

    <span class="token annotation punctuation">@Autowired</span>
    <span class="token keyword">private</span> <span class="token class-name">RedisTemplate</span> redisTemplate<span class="token punctuation">;</span>

    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">void</span> <span class="token function">contextLoads</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        redisTemplate<span class="token punctuation">.</span><span class="token function">opsForValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token string">"mykey"</span><span class="token punctuation">,</span><span class="token string">"hello"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>redisTemplate<span class="token punctuation">.</span><span class="token function">opsForValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">"mykey"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>

<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="4-测试对象的保存"><a href="#4-测试对象的保存" class="headerlink" title="4. 测试对象的保存"></a>4. 测试对象的保存</h2><p>我们编写一个实体类 User，测试一下对象的保存：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Test</span>
<span class="token keyword">void</span> <span class="token function">contextLoads</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token class-name">User</span> user <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">User</span><span class="token punctuation">(</span><span class="token string">"小牛肉"</span><span class="token punctuation">,</span><span class="token string">"20"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    redisTemplate<span class="token punctuation">.</span><span class="token function">opsForValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token string">"user"</span><span class="token punctuation">,</span>user<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>redisTemplate<span class="token punctuation">.</span><span class="token function">opsForValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">"user"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p><img src="https://gitee.com/veal98/images/raw/master/img/20200725105227.png"></p>
<p>🚨 报错：所有的对象都需要序列化。</p>
<p>将实体类序列化：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">User</span> <span class="token keyword">implements</span> <span class="token class-name">Serializable</span> <span class="token punctuation">&#123;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>OK！</p>
<h2 id="5-自定义-RedisTemplate"><a href="#5-自定义-RedisTemplate" class="headerlink" title="5. 自定义 RedisTemplate"></a>5. 自定义 RedisTemplate</h2><p><img src="https://gitee.com/veal98/images/raw/master/img/20200725105703.png"></p>
<p>上示代码中 <code>RedisTemplate&lt;Object,Object&gt;</code> 泛型选用的是两个 <code>Object </code>类，通常情况下，对于 <code>key </code>值我们一般会选用 <code>String </code>类型，使得我们每次都要进行强制类型转换。而且 <code>RedisTemplate </code>类默认采用的是 jdk 的序列化方式，但在真实的开发中，我们一般使用 Json 来传递对象，接下来我们自定义一个 <code>RedisTemplate&lt;String,Object&gt;</code>（新建一个 configuration.<code>RedisConfig</code>类）：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Configuration</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">RedisConfig</span> <span class="token punctuation">&#123;</span>
    <span class="token annotation punctuation">@Bean</span>
    <span class="token annotation punctuation">@SuppressWarnings</span><span class="token punctuation">(</span><span class="token string">"all"</span><span class="token punctuation">)</span>
    <span class="token keyword">public</span> <span class="token class-name">RedisTemplate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">></span></span> <span class="token function">redisTemplate</span><span class="token punctuation">(</span><span class="token class-name">RedisConnectionFactory</span> factory<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">// 为了开发方便，一般直接使用 &lt;String, Object></span>
        <span class="token class-name">RedisTemplate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">></span></span> template <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">RedisTemplate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">></span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        template<span class="token punctuation">.</span><span class="token function">setConnectionFactory</span><span class="token punctuation">(</span>factory<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// 默认是的用jdk序列化的，需要改成 Json 序列化</span>
        <span class="token class-name">Jackson2JsonRedisSerializer</span> jackson2JsonRedisSerializer <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Jackson2JsonRedisSerializer</span><span class="token punctuation">(</span><span class="token class-name">Object</span><span class="token punctuation">.</span><span class="token keyword">class</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">ObjectMapper</span> om <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ObjectMapper</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        om<span class="token punctuation">.</span><span class="token function">setVisibility</span><span class="token punctuation">(</span><span class="token class-name">PropertyAccessor</span><span class="token punctuation">.</span>ALL<span class="token punctuation">,</span> <span class="token class-name">JsonAutoDetect<span class="token punctuation">.</span>Visibility</span><span class="token punctuation">.</span>ANY<span class="token punctuation">)</span><span class="token punctuation">;</span>
        om<span class="token punctuation">.</span><span class="token function">enableDefaultTyping</span><span class="token punctuation">(</span><span class="token class-name">ObjectMapper<span class="token punctuation">.</span>DefaultTyping</span><span class="token punctuation">.</span>NON_FINAL<span class="token punctuation">)</span><span class="token punctuation">;</span>
        jackson2JsonRedisSerializer<span class="token punctuation">.</span><span class="token function">setObjectMapper</span><span class="token punctuation">(</span>om<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// String 的序列化</span>
        <span class="token class-name">StringRedisSerializer</span> stringRedisSerializer <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StringRedisSerializer</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// key采用String的序列化方式</span>
        template<span class="token punctuation">.</span><span class="token function">setKeySerializer</span><span class="token punctuation">(</span>stringRedisSerializer<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// hash的key也采用String的序列化方式</span>
        template<span class="token punctuation">.</span><span class="token function">setHashKeySerializer</span><span class="token punctuation">(</span>stringRedisSerializer<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// value序列化方式采用jackson</span>
        template<span class="token punctuation">.</span><span class="token function">setValueSerializer</span><span class="token punctuation">(</span>jackson2JsonRedisSerializer<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token comment">// hash的value序列化方式采用jackson</span>
        template<span class="token punctuation">.</span><span class="token function">setHashValueSerializer</span><span class="token punctuation">(</span>jackson2JsonRedisSerializer<span class="token punctuation">)</span><span class="token punctuation">;</span>
        template<span class="token punctuation">.</span><span class="token function">afterPropertiesSet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> template<span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">User</span> <span class="token punctuation">&#123;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>测试：</p>
<pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token annotation punctuation">@Test</span>
<span class="token keyword">void</span> <span class="token function">contextLoads</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token class-name">User</span> user <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">User</span><span class="token punctuation">(</span><span class="token string">"小牛肉"</span><span class="token punctuation">,</span><span class="token string">"20"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    redisTemplate<span class="token punctuation">.</span><span class="token function">opsForValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">set</span><span class="token punctuation">(</span><span class="token string">"user"</span><span class="token punctuation">,</span>user<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>redisTemplate<span class="token punctuation">.</span><span class="token function">opsForValue</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">"user"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>🎉 Successful ！</p>
<h2 id="📚-References"><a href="#📚-References" class="headerlink" title="📚 References"></a>📚 References</h2><ul>
<li><a target="_blank" rel="noopener" href="https://www.bilibili.com/video/BV1S54y1R7SB?from=search&seid=3325634079268895938">【狂神说Java】Redis最新超详细版教程通俗易懂</a></li>
<li><a target="_blank" rel="noopener" href="https://www.cnblogs.com/leeeeemz/p/12766186.html">SpringBoot整合Redis—自定义配置</a></li>
</ul>

                
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